Press guard



.gime 17' 192%o 3,498,5l0

l.. DAHLGREN PRESS GUARD Filed Dec. .15 1925 .v-sneenvsheer l June 17 1924 1,498,510

l.. DAHLGREN Filed Dec. 15. 192s 2 sheets-sneer 2 -V P @agunle, L

Patented .lime il?, 1924-.

LEONARD DAI-ILG-REN, OF IVIEEIDEN, CONNEGTICT.

'PR-ESS GUARD.

Application filed December 15, 1923.

T 0 alli/710mr t may concern Bc it known that l, LEONARD DAHLGREN, a citizen of the United States, residing at Meriden, in the county of New Haven and State of Connecticut, have invented new and useful Improvements in Press Guards, of which the following is a specification.

This invention relates to certain new and useful improvements in press guards and pertains more especially to a safety guard or the like which operates to engage the hand of the operator and move same out of the path of the descending plunger or press head just prior to the plunger or head completing its working stroke.

The primary object of the invention is to provide a safety guard which is effective and certain in action and which is of simple and economical construction, involving a minimum of parts compactly related and capable of being easily applied to the press.

A further object of the invention, is to provide a device of this kind which can be easily and conveniently set so as to enter into action at any predetermined time in the descent of the plunger and which also. is capable of giving after performing its function in event of encountering an obstruction, to thereby prevent breakage.

The invention has still further and other objects which will be later set forth and manifested in the course of the following description.

In the drawings Figure 1, is a perspective view of the invention applied to a power press;

Figure 2, is a similar view, showing the plunger in the act of descending and the safety device in operation, and

Figure 3 is a section taken on line 3 3 of Figure 2.

ln the drawings and in proceeding in accordance with the present invention, a press is illustrated which has a frame 1; a bed 2 and anvil 3 thereon and a vertical reciprocat-'ory plunger 4, it being of course understood that the form of the above parts having nothing to do with the invention, but are employed to illustrate the application of the invention.

A frame member or casing 5 is suitably affixed, as by bolting, as indicated at 6, to the press frame and is formed with a channel or slideway 7 in which a rack 8 is mounted for sliding` movements. The casing 5 is formed With it SlOt 8 in which. is disposed Serial No. 680,984.

in, the latter being carried by the inner end of rack 8.

A stub shaft 15 is journaled in a bearing 16 carried by the casing and has a pinion 17 rigidly affixed thereto, the pinion meshing with the teeth of the rack 8, so as to eect rotation of the shaft upon sliding of the rack. An L-shaped safety arm 18 is provided for the purpose of engaging the hand of the operator and for brushing same aside and out lof the path of the descending plunger, and is connected to the lower end of the stub shaft 15 by means of a coupling 19. The coupling consists of two similar sections or members having complementary concavities forming sockets in which the vertical part of the arm 18 and the shaft are received. The coupling sections are secured together by screws 20, which latter allow setting of the safety arm 18 in varying horizontal and vertical positions so as to enter into action in different horizontal and vertical planes during the descent of the plunger. Also, the screws can be set so as to allow of sliding of the safety arm relative to the coupling and also sliding of the coupling relative to the shaft upon the safety arm encountering substantial resistance of an obstruction, to thereby prevent breakage of the parts. Y

In operation, when the plunger is in up position or at the end of its upward stroke, the parts occupy the position depicted in Figure 1, of the drawings, the roller 14 occupying the lower end of the cam slot 13 and the horizontal member of the safety arm lying adjacent to orl against the press frame.

pon downward movement of the plunger, the cani slotgradually moves the roller 14 and thereby the rack outwardly or to the left,

effecting rotation of the shaft 15 and thereby 105 of the safety arm, causing the latter to sweep across the anvil or press bed so as to brush the operators hand aside in event of the latter being in the path of the oncoming `alunofer as shown in Fiofure 2. The con lin L10 l e e 19 allows desired setting of the safety arm according te the Werk being performed.. Tit

A cam mem- 60 lied will be seen that the safety arm has an arclike movement sweeping cross the anvil or press-bed during the working and idling strokes of the plunger so' as to enter into action on the working stroke and dislodge or move the operators hand out of the danger zone.

Having thus described my invention, what l claim as new and desire to secure by Letters Patent is l. in a safety guard for power presses, a casing formed for attachment to the press frame and having a slideway and a slot, a rack in the slideway having a projection movable along the slot, a slotted cam formed for attachment to the reciprocating press head, a roller on the rack received in the cam slot, a shaft ournaled .in the easing and having a pinion in mesh with the rack teeth, an L- shaped safety arm, and a coupling adjustably connected to the vertical member of the safety arm and to the shaft whereby oscillatory movement of the shaft will effect corresponding movement of the safety arm.

2, ln a safety guard for power presses, a sliding raekhaving a projection, means to mount the rack on the frame of a press, a cam formed to engage the rack projection and to be secured to the reciprocating press head, a shaft carried by the mounting means and having a pinion in mesh with the rack teeth, and a safety member carried by the shaft.

3. In a safety guard for power presses, a sliding rack having a projection, means to mount the rack on the frame of a press, a cam formed to engage the rack projection and to be secured to the reciprocating press head, a shaft carried by the mounting means and having a pinion in mesh with the rack teeth, an L-shaped safety member, and means to adjustably couple the vertical arm of the safety member to the shaft.

l. ln a safety guard for power presses a horizontally slidable member, means to mount the member on a press frame, a vertical shaft, means for oscillating the shaft upon sliding of said attachment to the press head to reciprocate the slidable member upon reciprocation of the head.

ln testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEONARD DAHLGREN. lVitnesses:

S. N. BARRY, J. A. MILLER. 

